A032231 "DGK" (bracelet, element, unlabeled) transform of 2,2,2,2,...

1, 2, 3, 6, 9, 14, 24, 40, 64, 120, 197, 348, 609, 1098, 1808, 3078, 5602, 9118, 15789, 25568, 43857, 73632, 120882, 195236, 317706, 532906, 843805, 1387158, 2184539, 3473958, 5532978, 8954424, 13933058, 21956952

Offset

0,2

Links

Andrew Howroyd, Table of n, a(n) for n = 0..1000

C. G. Bower, Transforms (2)

Prog

(PARI) seq(n)=[subst(serlaplace(p/y + polcoeff(p, 1) + polcoeff(p, 2)), y, 1)/2 | p <- Vec(y-1+prod(k=1, n, 1 + x^k*y + O(x*x^n))^2)] \\ Andrew Howroyd, Sep 13 2018

Crossrefs

Sequence in context: A115856 A147007 A146937 * A200273 A303664 A190276

Adjacent sequences: A032228 A032229 A032230 * A032232 A032233 A032234

Keyword

nonn

Author

Christian G. Bower

Extensions

a(0)=1 prepended by Andrew Howroyd, Sep 13 2018

Status

approved